#coding=utf-8
#print("hello world")
name = input('please enter your name: ')
print("hello,", name)
print("I'm ok")
a=ord('A')
b=chr(65)
print(a,b)
for i in range(1 , 5): print(i)
a = -100
if a >= 0:
    print(-a)
else:
    print(a)
sum = 0
n = 99
while n > 0:
    sum = sum + n
    n = n - 2
print(sum)
